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root@swann:~# apt-get update

Get:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease [30.5 kB]

Err:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease

  The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>

Reading package lists... Done

W: GPG error: http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease: The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>

E: The repository 'http://http.kali.org/kali kali-rolling InRelease' is not signed.

N: Updating from such a repository can't be done securely, and is therefore disabled by default.

N: See apt-secure(8) manpage for repository creation and user configuration details.

deb http://http.kali.org/kali kali-rolling main contrib non-free

# For source package access, uncomment the following line

# deb-src http://http.kali.org/kali kali-rolling main contrib non-free

root@swann:~# apt-get update

Get:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease [30.5 kB]

Err:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease

  The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>

Reading package lists... Done

W: GPG error: http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease: The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>

E: The repository 'http://http.kali.org/kali kali-rolling InRelease' is not signed.

N: Updating from such a repository can't be done securely, and is therefore disabled by default.

N: See apt-secure(8) manpage for repository creation and user configuration details.

deb http://http.kali.org/kali kali-rolling main contrib non-free

# For source package access, uncomment the following line

# deb-src http://http.kali.org/kali kali-rolling main contrib non-free

root@swann:~# apt-get update

Get:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease [30.5 kB]

Err:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease

  The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>

Reading package lists... Done

W: GPG error: http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease: The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>

E: The repository 'http://http.kali.org/kali kali-rolling InRelease' is not signed.

N: Updating from such a repository can't be done securely, and is therefore disabled by default.

N: See apt-secure(8) manpage for repository creation and user configuration details.

deb http://http.kali.org/kali kali-rolling main contrib non-free

# For source package access, uncomment the following line

# deb-src http://http.kali.org/kali kali-rolling main contrib non-free

root@swann:~# apt-get update

Get:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease [30.5 kB]

Err:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease

  The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>

Reading package lists... Done

W: GPG error: http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease: The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>

E: The repository 'http://http.kali.org/kali kali-rolling InRelease' is not signed.

N: Updating from such a repository can't be done securely, and is therefore disabled by default.

N: See apt-secure(8) manpage for repository creation and user configuration details.

deb http://http.kali.org/kali kali-rolling main contrib non-free

# For source package access, uncomment the following line

# deb-src http://http.kali.org/kali kali-rolling main contrib non-free

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